Using the following database schema I’m trying to achieve this…
Each store is on 1 Tariff that has different costs based on the day on the week.
Store 1 is on the low tariff
Monday – Sat – $1.00
Sunday – $0.50
Store 2 is on high tariff
Monday – Fri – $2.00
Sat – $1.00
Sunday – $0.50
There could be hundreds of different variations of these tariffs.

Does the schema above achieve this? Recommendations?
Thanks
The most straightforward tariff table implementation would look like this:
Your other alternative looks like this:
The primary key is the Store ID and Day of Week ID.